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http://hdl.handle.net/2248/3645| Title: | Analysis of Ca(+) K plage area for short period variation |
| Authors: | Singh, J Jain, S. K |
| Keywords: | Calcium Faculae Power spectra Sunspot cycle Twenty-seven day variation Autocorrelation Fast fourier transformations Solar rotation Spectrum analysis |
| Issue Date: | Dec-1989 |
| Publisher: | Indian Academy of Sciences |
| Citation: | Journal of Astrophysics and Astronomy , Vol. 10, No. 4, pp. 381 - 389 |
| Abstract: | Observations of solar Ca(+) K daily plage area from 1951 to 1977 are analyzed to search for short-period (12-13 day) variations. The 27-day periodicity due to solar rotation modulation is found at all latitudes. Using an autocorrelation technique a 12-13 day periodicity is found only in three of the 57 data sets examined. However, a weak peak around 12-13 days is found in the power spectrum of all of the data sets. It is suggested that two distinct active longitudes separated by about 140-170 degrees are the cause of the 12-13 day periodicity in the autocorrelation. |
| URI: | http://hdl.handle.net/2248/3645 |
| ISSN: | 0250-6335 |
| Appears in Collections: | IIAP Publications |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Analysis of Ca(+) K plage area for short period variation | 652.38 kB | Adobe PDF |  View/Open |
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